Artificial tooth.



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A. H. TAYLOR.

ARTIFICIAL TOOTH. APPLICATION FILED Nov. 6. I912.

THE NORRIS PETERS 60.. PH

OTC-LITHLI. WASHINOWON. D. C.

Patented Apr. 6, 1915.

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ALBERT H. TAYLOR, OF LIVERPOOL, ENGLAND, ASSIG-NOR- TO .VVESTERN DENTAL MANUFACTURING COMPANY (1914) LIMITED, 0)? BRISTOL, ENGLAND.

ARTIFICIAL 'roo'rn.

Application filed November 6, 1912.

To all whom it may concern:

Be it known that I, ALBERT HAMNETT TAYLOR, a subject of the King of England, residing at Glubmoor, Liverpool, in the county of Lancaster, England, have invented a new and useful Improved Artificial Tooth, of whichthe following is a specification.

This invention has reference to artificial teeth, and more particularly to the type called pin mineral teeth, which are fastened, or adapted to be fastened in the plastic backing in which they are held; and the object and effect of the invention is primarily to provide an improvement in connection with such teeth by which the connection or fastening of the tooth to the frame or plate is generally more secure, and causes the resistance of the tooth to be against the bite, so affording a great stability to the tooth.

According to this invention, the tooth has a projection on the back, the underside of which is cut to form a V shaped groove, which extends in the case of an upper single tooth, from the lower outer edge of this projection; and above this projection, a single anchor pin is secured or cast in the tooth during its manufacture. The projection engages with the hacking, and forms a secure fastening to the biting or active end of the tooth.

The invention is illustrated in the accompanying drawings, in which Figure 1 shows a single-tooth fitted to a backing, the plate or frame being in section; Fig. 2, is a back view of the tooth; and Fig. 3 an under plan view of the tooth.

Referring now to the drawings, a is the projection on the back of the tooth, showing the upwardly V shaped inclined or undercut recess between it and the body of the tooth; Z) is the single platinum or metal anchor pin; and c is the backing.

The projection a which is a part of the tooth, overhangs or projects beyond the lower part of the back of the tooth. The

Specification of Letters Patent.

Patented Apr. 6, 1915.

Serial No. 729,814.

invention is not restricted to this particular form of construction of the back of the tooth, as it will be varied to suit different requirements.

The projection a as shown in Fig. 2, is so shaped that the center portion of it is slightly lower than the side portions; and the sides of the tooth are curved or rounded inwardly toward the back, as seenin Fig. 3. Owing to the curvedror rounded sides of the tooth, the commencement of the projection (1 occurs at points a little distance within the extreme edges of the sides as shown, This enables teeth to be well fitted, and to be set closely to one another.

The invention is especially useful in connection with the front or single upper teeth, as it is these teeth, that are, in most cases, pressed outward by the lower teeth in biting food, as the upper edges of the lower teeth come under the lower or biting edges of the upper teeth, and press them outward. A tooth of the construction and form herein described, can be so firmly and securely fixed or set in the backing that abnormal pressure is necessary to press it out or break it away from the backing. Further the teeth cannot be loosened during the biting action, that is, when the lower teeth strike the lower and inner surface of the upper teeth, the pressing outward of the upper teeth is opposed by the projection a which is formed on each tooth and is securely held in the backing by reason of the recess beneath each of the projections being occupied by apart ,of the backing, and the under inclined surface of each projection being more or'less at right angles to the line of action tending to push the tooth from the backing, such pushing action being exerted by the lower teeth in the biting action. The whole setting and fastening of the teeth in the backing is exceptionally firm, and generally improved.

By the improved construction, one of the two platinum pins usually required, is dispensed with, and thereby considerable reduction in the cost of the teeth is obtained.

What is claimed is In testimony whereof I have signed my In an artificial tooth, the combination of name to this specification in the presence of 10 a biting edge, (in ovferhanging portion, a rear two subscribing Witnesses. surface eXten ing rom the biting edge for a part of the length, an undercut V-shaped ALBERT TAYLOR recess formed by the projection and rear surface and a single headed pin baked in the tooth substantially as described.

Witnesses: I ERNST M. RoYs'rER, JOHN P. WARD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

